package com.xxxx.server.config.security.component;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/***
 * jwt登录授权过滤器
 * @author Ding Yi
 */


public class JwtAuthencationTokenFilter extends OncePerRequestFilter {

    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        System.out.println("request:   " + request);
        String authHeader = request.getHeader(tokenHeader);
        System.out.println("tokenHeader:   " + tokenHeader);
        System.out.println("authHeader:   " + authHeader);
        /*存在token*/
        if(null != authHeader && authHeader.startsWith((tokenHead))) {
            String authToken = authHeader.substring(tokenHead.length());
            System.out.println("authToken:   " + authToken);
            String username = jwtTokenUtil.getUserNameFromToken(authToken);
            /*token 存在用户名但是未登录*/
            if (null!=username && null ==  SecurityContextHolder.getContext().getAuthentication()) {
                System.out.println("userDetailsService.loadUserByUsername(username)  start");
                UserDetails userDetails = userDetailsService.loadUserByUsername(username);
                System.out.println("userDetailsService.loadUserByUsername(username)  end");
                /*验证token是否有效，重新设置对象*/
                if (jwtTokenUtil.validateToken(authToken,userDetails)){
                    UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                    authenticationToken.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                }
            }
        }
        filterChain.doFilter(request,response);
    }
}
